Hundreds of years before the Pokémon Sparkling Diamond and Pokémon Sparkling Pearl adventures, you are thrust into the largely unexplored region of Hisui (now known as Sinnoh)! A world full of possibilities lies ahead, and you're given a mission to build the very first Pokédex for this region. As you explore, watch for Pokémon in their environment and throw the ancestor of the Poké Ball to try and catch them in real time. Tougher opponents will require your Pokémon's help in intense battles, but keep in mind that in this world, they'll also be real allies in collecting resources! The Legendary Arceus is at the heart of the story, so what role will this powerful Pokémon play in your adventure?